Process of repairing converter-bottoms



(No Model.)

B. RTRAND. PROCESS OF REP NG CONVERTER BOTTOMS.

No. 405,892. Patented June 18, 1889.

a; @MA @TQMWO UNITED STATES PATENT OFFICE.

ERNST BERTRAND, OF KLADNO, BOHEMIA, AUSTRIA-HUNGARY, ASSIGiNOR TO THEPOTTSTOI/VN IRON COMPANY, OF POTTSTOW'N, PENNSYLVANIA.

PROCESS OF REPAIRING CQNVERTER-BOTTOMS.

SPECIFICATION forming part of Letters Patent No. 405,392, dated June 18,1889.

Application filed July 19, 1888- Serial No. 280,437. (No model.)

To all whom it may concern.-

Be it known that I, ERNST BERTRAND, a citizen of the United States, atpresent a resident of Kladno, Bohemia, Austria-Hungary, have invented aProcess of Repairing Converter-Bottoms, of which the following is aspecification.

The object of my invention is to so repair the bottoms of converters forthe basic process that the said bottoms will last fora greater number ofheats than in the ordinarypractice.

In the accompanying drawings, Figure 1 is a vertical section of aconverter, illustrating the manner in which the bottom and tuyeres of aconverter ordinarily become burned or out out by the molten charge; andFig. 2 is a sectional view of the bottom of a converter, illustratingthe manner in which I repair the bottom.

In practice, when a new bottom A is put in a basic converter B, thesurface-level of the bottom is at the dotted line a b c, Fig. 1; butafter a few heats it is burned out or cut away by the intense heat ofthe molten charge to the line a d 0, say, and after one or two heats itgets out down to, say, the line a e c. The tuyeres T T are, as a rule,out or burned away faster than the material of the bottom itself in thebasic process, so that if burning out 0 is allowed to continue thebottom could be used only for perhaps five heats before it becamenecessary to replace the bottom by a new one.

It was the custom at one time in the acid process to introduce newtuyeres before the bottom was burned out and to put in a small quantityof ground ganister mixed with water in the annular space left betweenthe newly-inserted tuyeres and the bottom, but

only up to the burned-out level, no attempt being made to build up tothe original surface-level or otherwise repair the bottom of theconverter. This practice was, however, abandoned, because it was foundthat the ground ganister would not adhere properly, except where wedgedin around the tuyeres, and it saved time to continue to use the bottomof the converter until it with its tuyeres became so far burned downthat it was necessary to remove the entire bottom and replace it by anew one.

I have found that by rebuilding the bottom with basic lining material upto the original surface-level after each heat the life of a basicconverter-bottom can be greatly prolonged, so much so, in fact, as toequal the life of the vessel itself. This repairingI effect in situwithout removing the bottom from the converter, so that during the wholelife of the vessel it is unnecessary to change the bottom.

In carrying out my invention I proceed as follows: After each heat isblown (except where in some cases the first two or three heats do notmake serious inroads into the bottom of the converter) the bonnet-plateD is taken off and all the tuyeres which are too short to last throughthe next heat are removed by any suitable means. New tuyeres are thenplaced in the bottom, the bonnetplate is replaced, and the converterturned up to the position shown in Fig. 1. A mixture of tar and grounddolomite or other known basic lining material out of which to build upthe bottom is then thrown in at the nose of the converter, so that itfalls on the bottom in the desired place. After, say, fifteen seconds,the blast is turned into the converter in order to clear the holes ofthe tuyeres from any of the tar and dolomite or other material which mayhave fallen thereon. More of the mixture is then thrown in and thetuyere-holes cleared by the blast, and the operation is repeated untilthe bottom has been built up to the original line or surface-level a bc. The converter is then allowed to stand for, say, ten to twentyminutes, to give the tar an opportunity of becoming cooked and themixture thoroughly solidified. The converter is then ready for the nextblow, and in this way the blowing of a heat and the repairing of thebottom follow each other alternately.

I claim as my invention- The mode herein described of prolonging thelife of a basic converter-bottom, said mode consisting in alternatelyblowinga heat to this specification in the presence of tWo subancl theninserting new tuyeres and rebuilclscribing Witnesses. ing With basiclining material the partiallyburnecl bottom up to the original surfaoe-ERNST BERTRAND' 5 level, whereby the bottom is so rebuilt afterW'itnesses:

each heat, all substantially as set forth. GUSTAV MUCHY,

In testimony whereof I have signed my name ADOLF FISCHER.

